Optolong L-eNhance Filter - 2"

  • The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.
  • Isolates H-alpha, H-beta, and Oxygen iii Nebula Emission Lines
  • The bandwidths are 24 nm for OIII and H-beta, and 10 nm for Ha
  • Maximum Transmission of up to 90%
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  • Regular price $229.00

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Optolong L-eNhance Filter - 2"

About L-eNhance Filter

The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astrophotographers. The current fixes to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.

L-eNhance provides an economical and practical fix for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. 

Optolong believes the design of their L-eNhance filter is a technical innovation among filters. It effectively isolates the H-alpha, H-beta, and Oxygen iii nebula emission lines and achieves a maximum transmission of up to 90-percent. The performance of this filter delivers images that control the impact from light polluted skies.


L-eNhance Filter Spectrum Curve

The bandwidths:

= 24 nm for OIII and H-beta

= 10 nm for Ha



Compare the L-eNhance, L-eXtreme, and L-Pro filters:

Optolong L-eNhance Filter - 1-25-transmission-01

Optolong L-eNhance Filter - 1-25-transmission-02

Optolong L-eNhance Filter - 1-25-transmission-03

You can also view these charts in greater detail in the Gallery

Optolong specially designed and optimized their dual-band L-eNhance filter according to the characteristics of celestial body emission lines and features of the light pollution spectrum span. This retains the prominent color of nebula RGB while blocking out most of light pollution.


BandpassMulti Bandpass
Filter ShapeRound
Filter Thickness1.85mm
Filter TypeLight Pollution/City Light Suppression
Free ShippingYes


Package Details

  • Silver cardboard box
  • Plastic PP box
  • Imported high pressure EVA case lining


Customer Reviews
4.9 Based on 13 Reviews
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Filter Reviews:
Xavier L.
Mexico Mexico

I have been using this filter at least 3 times and every time I have successfully photographed emission nebulas under a heavy light pollution environment , works fantastic !

Fred S.
United States United States
Experience with L-eNhance Filter

I have been imaging with this filter with a modified Nikon D850 on a Stellarview F910, D130, f/7 refractor. In the past few weeks I have imaged the Heart, Rosette and Cone Nebulas with excellent results. Transmission is good, which does not require much exposure increase vs use of a UV/IR-cut filter and gives much more vivid reds, as expected. As published in a review of the filter, it is not going to work on reflection nebulas, just emission. It helps to create a custom white balance for use with this filter for the colors to come out right. I have been very pleased with this filter.

United States United States
L-eNhance Really Does Enhancce

Used with both Esprit 120 and Zenithstar 61 on moonless nights. Best detail I ever achieved of the Trifid, Lagoon, and Eagle nebulae. Having multiple bandwidths sensitive to emission and reflection nebulae is a real time saver. This was from the city in a heavily light polluted environment.

Tony O.
United States United States
N enhance filter

Good! Five stars

United States United States
excellent delivery

Got this item quickly as promised. Did not have a chance to use it yet.

Stephen G.
United States United States
Optolong L-eNhance filter

Had great hopes, but somewhat disappointed. In a semi-rural area with Bortle 5-6. C-14 with ZWO294MC. Did not see much improvement - until I imaged M1. Spectacular. So can do very well on nebulae, as intended, but not much else and needs at least 2 more stops of exposure. Only a few nights experience due to weather and lack of suitable objects.